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Financing: At-the-Market Equity Offering Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 27, 2020
Dec. 31, 2021
Dec. 31, 2019
Jun. 30, 2021
Aug. 03, 2020
At The Market Equity Offering Program Authorized Aggregate Value       $ 300,000 $ 400,000
Private Placement          
Payments of Stock Issuance Costs $ 1,000        
Sale of Stock, Number of Shares Issued in Transaction 1,200,000        
Sale of Stock, Price Per Share $ 81.77        
Sale of Stock, Consideration Received on Transaction $ 99,000        
Common Stock          
At The Market Equity Offering Program Shares Issued   1,812,197 1,328,332    
At The Market Equity Program Proceeds from Sale of Stock   $ 119,000 $ 99,000    
Payments of Stock Issuance Costs   $ 1,100 $ 1,200